A version-pinned reference skill documents Expo SDK 56 and 57, versions of the toolkit for building React Native mobile apps, including their package versions and migration differences.

Use it to build or upgrade Expo apps on SDK 56 or 57 and to check supported native-module versions and migration changes.

It provides checked information for these specific releases, whose details may differ from older documentation or memory.

expo-56 — Skill for Claude Code by mahdi-salmanzade

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add mahdi-salmanzade/expo56-skill --skill expo-56

Clone the repo

git clone --depth 1 https://github.com/mahdi-salmanzade/expo56-skill

Made for: Claude Code.

Or install expo-56, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mahdi-salmanzade/expo56-skill/expo-56/github.svg)](https://agentmods.dev/skills/mahdi-salmanzade/expo56-skill/expo-56)

Your own site

<a href="https://agentmods.dev/skills/mahdi-salmanzade/expo56-skill/expo-56"><img src="https://agentmods.dev/badge/skills/mahdi-salmanzade/expo56-skill/expo-56/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mahdi-salmanzade/expo56-skill/expo-56"><img src="https://agentmods.dev/badge/skills/mahdi-salmanzade/expo56-skill/expo-56.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 391 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 6,647 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00391	$0.06647
Opus 5	$0.00196	$0.03324
Sonnet 5	$0.00078	$0.01329
Haiku 4.5	$0.00039	$0.00665

Measured 12d ago against content hash 25cd0406ae4f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

expo-56 scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

expo-56/skills/expo-56/SKILL.md · 230 lines

How it starts

The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Expo SDK 56 & 57

Audited against the expo/expo release branches origin/sdk-56 and origin/sdk-57 on 2026-07-25. SDK 57 shipped 2026-07-08; its latest patch is 57.0.8 (published 2026-07-22, dist-tag latest). SDK 56 shipped 2026-06-01 and is still actively patched — latest 56.0.17 (published 2026-07-23, dist-tag sdk-56), i.e. newer than the SDK 57 patch. The supported window is SDK 54–57.

Sourcing rule — this matters more than it sounds. Version pins here come from packages/expo/bundledNativeModules.json on the release branch (git show origin/sdk-57:packages/expo/bundledNativeModules.json), because that file ships inside the expo package and is what expo install resolves against. Two tempting sources are wrong:

docs/public/static/schemas/v56.0.0|v57.0.0/native-modules.json is stale — it still lists react-native-screens 4.25.2 and expo-router ~56.2.9 when the shipped values are ~4.26.0 and ~56.2.16.

The main branch contains post-57 work destined for SDK 58. Anything under ## Unpublished in a CHANGELOG, and any packages/*/package.json value on main, is not in SDK 57.

Re-verify with npx expo install --fix after any patch bump; this is a point-in-time snapshot.

This skill is a version-pinned API reference, not a task playbook. It covers building on SDK 56 or 57, and the 55→56 and 56→57 migrations. Expo's own official skills are playbooks for the newest SDK and carry no version pins — see Composing with the official Expo skills. Use both.

Step 1: Establish which SDK the project is on

Do this before answering anything version-specific. A user saying "latest Expo" may be on either release. The genuine 56↔57 differences that silently break code are narrow: prebuild semantics, expo-camera's iOS default pictureSize, and the RN 0.86 bump. Most other "SDK 57" changes were also backported to the 56 line — check the patch version before telling anyone to upgrade.

Read the full file on GitHub · 230 lines

Files

What ships with it

22 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 230 lines · 391 tokens per session scan A 25cd0406ae4f

Subscribe to this mod's changes

expo-56 is a skill published in the GitHub repository mahdi-salmanzade/expo56-skill (2 stars, last pushed 1mo ago), licensed MIT. It adds 391 tokens to every session and 6,647 once invoked, about $0.0020 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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